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Originally Posted by fahrgewehr2
What was the response?
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They basically say to stick with the mfg's. recommendation.
Also, and very important, is your kind of driving-cycles.
I.e. short trips, cold weather, hot weather, dusty conditions, etc.,play a big role in the equation.
They also stress the importance of well-filtered air ( to eliminate dirt contamination of the oil ).
You'll just have to go to the local Supermarket, read the article............and then place the magazine back on the shelf.